Scraper



Jan. 28, 1958 v@ LlEsUNAlTls SCRAPER Filed Jan. '18, 1957 Kyt'aatasUnited States The present invention relates to scrapers and moreparticularly to a finishing scraper adapted to remove paint, varnish andthe like surface coating, while leaving the decoated surface with asmooth nish which will not require any further finishing operations suchas sand papering, buing and the like.

The present invention is an improvement over the invention described inthe U. S. Patent No. 2,756,499 dated July 31, 1956 by the same inventor.

The scraper, according to the present invention, is of the type in whichthe blade is removably held by a clamping device formed of two jaws, oneof which provides a flat surface area to contact the blade in the atstate, and the other of which provides a curved surface area with itsconcavity opposite the flat surface area of the other jaw so as tocontact the blade when the latter is in a curved state.

The general object of the present invention is the provision of ascraper of the character described having easily operated means forvarying the curvature of the blade from a flat position to a maximumcurved position to thereby vary the scraping depth of the bladeaccording to the desire of the operator.

Still another important object of the present invention is theprovision, in a scraper of the character described, of means for varyingthe curvature of the blades which are easily and quickly operated by thesimple operation of a small lever.

Yet another important object of the present invention is the provisionin a scraper, of easily and quickly operated igeans for permittingremoval and replacement of the Another important object of the presentinvention is the provision of a scraper of the character described whichis of relatively simple and inexpensive construction.

The foregoing and other important objects of the present invention willbecome more apparent during the following disclosure and by referring tothe drawings in which:

Figure 1 is a perspective view of the iinishing scraper according to thepresent invention;

Figure 2 is a partial plan view of the same, looking underneath;

Figure 3 is a longitudinal section along line 3-3 of Figure 2;

Figure 4 is a perspective view of the pusher element adapted to causethe blade to take a curved position; and

Figures 5, 6 and 7 are diagrammatic views of the blade and leveroperated cam in their respective corresponding positions to obtaindifferent curvatures of the blade.

Referring now more particularly to the drawings in which like referencecharacters indicate like elements throughout, the reference numeral 31indicates a wooden handle having an adequate length so that the scrapermay be gripped by both hands. The end 31' of the handle 31 is providedwith a ferrule 32 and a clamping member, generally indicated at 33, isinserted within said end 31 of said handle so as to be rigid therewith.The clamping i atent i Patented Jan. 28, 1958 member 33 is preferablymade of heavy sheet metal and consists of a straight leg part 34 ofsubstantially inverted U-shaped cross-section and is in alignment withthe handle 31 and provided at its outer free end with an enlargement 35so as to impart to the member 33 a generally T-shaped configuration. Theenlargement 35 forms a transverse jaw, the front marginal portion 36 ofwhich is slightly outwardly curved. The edge 37 which extends along thewhole periphery of the jaw 35, lies in a iat plane and is adapted tocontact the scraping blade 38 over the complete area of said edge 37when the blade 38 is in flat condition.

A second clamping member, generally indicated at 39, is pivotallymounted on the clamping member 33 by means of a pivot pin 40 for pivotalmovement between an open position (shown in dot and dash line in Figure3) and a closed position opposite and partly nesting within the clampingmember 33. The clamping member 39 is made of heavy sheet metal andprovides a leg member 41 having a substantially U-shaped cross-sectionand adapted to nest within the leg member 34 of the clamping member 33.The outer free end of the leg member 41 is provided with an enlargement42 having its longitudinal dimension disposed at substantiallyright-angles to the leg member 41 and providing the other jaw member forthe scraper.

The jaw member 42 has an inturned ilange 43, the edge 44 of which liesin a curved plane and is adapted to contact the underface of the blade38 when the latter has a maximum curvature. In the closed position ofthe clamping member 39, the jaw 42 is disposed opposite the jaw 35 andthe edges 44 and 37 of said jaw members are substantially opposite eachother and, when the blade is removed, contact each other only at thelateral end portions of the jaws, as clearly shown in Figure 2, due tothe concavity of the plane in which the edge 44 lies. The lateral endsof the jaw member 42 are provided with integral upstanding lugs 45 whichhave a curved crosssection to provide reinforcement therefor. The lugs45 are adapted to engage notches 46 made in the ends of the blade 38 andare adapted to securely position said blade 38 relative to the lower jaw42 in order to prevent relative displacement between the jaws and theblade.

Thus, when the blade 38 is positioned by the lugs 45 of the lower jaw 42and said lower jaw brought into closed position with respect to theupper jaw 35, the blade is securely held between the two jaws only atthe ends of the blade, while the portion of the blade intermediate theends of the jaws can be made to assume any curved position between thespaced edge portions of the jaws, therefore, the curvature of the bladecan be adjusted.

The lower clamping member 39 is removably secured in closed position bythe following means.

A resilient elongated strip 50 is disposed within the leg 34 of theupper clamping member 33 with one end in slidable contact on the pivotpin 40 of the lower clamping member 39, while its other end isdownwardly curved at 51 to provide a latching portion 52 adapted toengage underneath a transverse pin 53 secured to upstanding ears 54 atthe sides of the lower clamping member 39. The latching portion 52 ofthe strip 50 is retained in resilient engagement with the transverse pin53 by means of a bolt 55 which passes through an enlongated slot 56 ofthe upper portion of the leg 34 of the clamping member 33, and is inthreaded engagement with a button 57 slidable over said leg 34 with theinterposition of a curved washer 58.

It will be understood that actuation of the button 57 longitudinally ofthe leg 34 will cause forward and backward movement of the strip 5l)into and out of engagement with the transverse pin 53 of the lowerclamping member 39. The strip 50 is kept pressed against the head 59ofthe bolt 55 by means of a coil spring 60 disposed between the strip 50and a washer V61 which contacts the underface of the top wall of the leg34.

The meansfor causing the .blade 38 to. assume 4various degrees ;ofcurvature comprise a rocking..member`in. the form of .a curvedplate 62,showniniFigureA 4, having, at one enda downturned marginal.porti`onf63/` adapted'to contactthe upper face of the. blade .38 `.atsubstantially rightangles, andprovided in itsV uppermost portion with a.longitudinall slot 64- adapted `to Vreceive a-pivot` stud 65 fofsubstantially rectangular. cross-section andhaving a head .661adapted to.be secured .to the top wall kportion of the clamping Vmember 331 atthe.root .of the jaw member 35. Ther-plate 62 is. retained in engagement`with the stud 65 by means of a transverse pin 67 which passes.

through the projecting. end lportion of stud ,65. The portion4 of theplate .62.b`ehind the stud 65 isdownwardly curved, `as shown at.6`8,andisV in slidablecontact with a cam element 69 whichfissecured toasquare shaft 70 which is journalled in-the downwardly extending ears 71of theside walls ofthe upper leg 34vof the clamping member 33. The.shaft ,70 is provided with a lever arm 72 extending on the outside ofthe-clamping member 33. Y The cam 69 consists of a substantiallyrectangular, at metal piece which is eccentrically mounted on the shaft70. Referring to FiguresS` to inclusive, when the lever arm72 is inuprightposition, the rstcam face 73 of the cam. 69 contacts the portion:68 lof the plate 62, whereby the blade contacting portion 63 of theplate 62 is. in its uppermost position and the blade 38 is allowed totake a at position. inV full .Contact with the edge 37 of the jaw 35.When the lever arm 72 isrotated so as to point towards the handle31',.the second cam. face 74 of the cam 69 comes in contact withtheportion 68,01? the plate 62 and raises said portion. 63 so as to4cause the marginal `portion 63 of the plate 62' to press down on theCenter portion of the blade 33, so thatV the latter assumes anintermediate curved position as shown in Figure 6. When the lever 72isturned downwardly, as shown in Figure 7, the cam face 75 of the cam69.cornes in contact with the portion 68 of the plate 62 and causesdownward movementof the marginal edge portion 63 of said plate 62 tofurtherdepress the blade 38. into its maximum curved position. In saidposition, the lower face of the blade 38 is in full contact with thecurved edge 44- of the lower jaw 42.v

The plate 62 is provided with a spring-pressed slidably mounted stud 76which is adapted to Contact the underface of the leg 34 of the clampingmember -33 so as to cause the portion 68 to always be in: contact witheither one of the cam faces`73, 74-and 75 of the cam 69.

From the foregoing it will be apparent that by simple manipulation ofthe lever arm 72, the blade 33 canr take either one of three positions,namely a at position as I shown in Figure 5, an intermediate curved`position as shown in Figure 6, and a fully curved position as showninFigure 7. In all of said three positions, the blade is securely heldbetween the jaws 35and 42 because it is contacted at .the ends of saidjawvand pressed between the same.

The blade 33 has a generally rectangular shape and is generallysymmetrical about its longitudinal notches 46 so that either 'one of itsscraping` edges 77 and 7 8 may be used. The blade can have other shapesthan thatfillustrated in the drawings. For instance, the scraping edges77 and 78 may be much shorter than the length of the blade and may bealso straight or convex so that the blade will be able to scrape at agreater depth than the blade 38 illustrated inthe drawings.

lThe scraper, according to the present invention, has been found to bevery useful vfor removing coatings from wooden surfaces without'marringthe said Vsurface whereby it is not necessary to further finish thesurface byline sanding or buftng inorder to obtain aV smooth surface.

stood that various modifications may be resorted to withv out departingfrom the :spirit "andi scopeoflthezappended Y claims. Y

I clai'rn 1. In a scraper,ia-fb1ade',.: agbladeYY clamping mechaf nismcomprising a pair of clamping members each having a clamping jaw, meansto press said jaws one against the other in opposite relation, the upperone of said clamping jaws providing an edge portion lying in-asubstantially flat plane, the lower one of said clampingjaws 'providing`an edge portion lying in a curved plane, said jaws securely contactingthe blade only at the ends thereof' a rock-k ing member pivotallymountedintermediate its ends ,on one-of said members and havingl one-endadapted to contact the upper. face ofrsaid bladeat that portionintermediate the endsl of the clamping jaws, and a lever operated Ycammember contacting the other end of said rocking member forrockin'gjvsaidmember about its pivotal pointV to various angular positions.

2."In va scraper as claimed:4 in claim 1, wherein. one of said' clampingmembers istpivotally mountedon the other clamping member, said'other'clamping. member having'. a handle, and further including' means Vtolock the pivoted-` clamping member in a position'in which the' ends ofits jaw member lare in' contact with the endsv of the jaw.

member of the other clamping member.

3i InV a-scraper as claimedfin claim 2, wherein said locking meanscomprise a' stripV of resilient material mounted within'the'clampingmember provided with said'f handle, for longitudinal movement ywithinthe same, an actuating button slidablyv mounted on said same clamp-v ingmember for longitudinal movement thereon and connected to saidstrip forvmoving said strip between an unlocking position, in'which said Vstripclears' a transverse pin mounted on said pivoted clamping member, and alocking position-in engagement'with said transverse pin.

4. In a scraper as claimed in claim 3, wherein said rocking membervconsists in a curved plate pivoted intermediate itsends'on the clampingmember provided withY the clamping jaw withan edge portion lying inaflat plane, said curved plate having one downturned end engageable iwith the portion of said blade between its clamped ends and having itsother end in contact with said cam member, and furtherrincludingresilient means to press said other end of said rocking memberlagainstsaid cam member.

5. In ascraperas claimed in claim 4, further including a lever.extendingfoutside of said clamping 'members' and4 connected to said cammember for .rotating the same: 6.v In .a scraperr a's/clain'ied` inclaimV 5, whereinfsaid cam member consists ina flat substantiallyrectangularpiece having-camz edges lprogressively distant from 'themounted on `saidirstV member adjacent said handle-and.v

pivotabletoa position nwhich its cross leg s in sub-. stantialregistering relationship with the cross leg of said first T-shaped.member, the crossleg of said rst T-shaped .5 member providing a bladecontacting area lying in a substantially at plane to contact a at bladeover substantially the entire area of said blade contacting area, thecross leg of said second T-shaped member having a blade contacting arealying in a curved plane, the concavity of said plane being directedtowards the blade contacting area of the cross leg of said rst T-shapedmember, said blade contacting area of said second T-shaped memberadapted to contact over its entire area a blade in a curved position,means to press said T-shaped members one against the other to retain ablade between their respective blade contacting areas, means to firmlyposition said blade in between said clamping members, said blade beingretained between said clamping members only at the ends of the crosslegs of said clamping members and being hee intermediate said ends, arocking member disposed Within one of said clamping members and cammeans engaging said rocking member to rock the same into engagement withsaid blade to vary the curvature of said blade.

9. A scraper as claimed in claim 8, wherein said cam means comprise ashaft journalled in one of said clamping members, a cam member ofsubstantially rectangular shape eccentrically mounted on said shaft, anactuating lever for said shaft extending outside said one clampingmember and means to resiliently maintain said rocking member inengagement with said cam member.

l0. A scraper as claimed in claim 8, wherein said means to press saidclamping members one against the other comprise a longitudinallydisplaceable strip mounted within one of said clamping members, anactuating button slidably mounted on said one of said clamping membersand connected to said strip for longitudinally displacing the same, atransverse pin mounted in the other of said clamping members, said stripbeing movable into a position engaging said pin for locking saidclamping members together.

References Cited in the tile of this patent UNITED STATES PATENTSHatfield Feb. 8, 1916 2,756,499 Liesunaitis July 3l, 1956

